We have been using Kutools for Outlook which has been working fine but on Friday 15th Jan 2021 windows update installed to couple of large updates, since then if Kutools is installed we cannot open, forward or reply to emails at all (clicking the buttons does nothing).  After uninstalling Kutools the emails work OK again so it seems there is something in the latest Windows updates which is conflicting with Kutools.

I have had to leave Kutools for Outlook uninstalled until some news of a patch appears.

Would be interested to see if anyone else has the same problem?